feat: phase 1 — data downloader, backtrader runner, SMA strategy

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

run_example.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+"""End-to-end smoke test: download data -> backtest SMA crossover -> print results."""
+import logging
+from backtest.config import BacktestConfig
+from backtest.runner import BacktestRunner
+from strategies.base import SmaCross
+from analysis.report import print_results
+
+logging.basicConfig(level=logging.INFO, format="%(asctime)s [%(levelname)s] %(message)s")
+
+
+def main():
+    config = BacktestConfig(
+        symbols=["sh600000"],  # 浦发银行
+        start_date="2023-01-01",
+        end_date="2024-12-31",
+        initial_cash=1_000_000,
+    )
+
+    runner = BacktestRunner(config)
+    results = runner.run(SmaCross)
+    print_results(results, config.initial_cash)
+
+
+if __name__ == "__main__":
+    main()